Tire puncture preventive



106. COMPOSITIONS,

comma on PLASTIC Patented Feb. 7, 1933 UNITE!) STATES Cross ReferenceBOY CROSS, OF KANSAS CITY, MISSOURI, ASSIGNOR '10 SILICA PRODUCTSCOMPANY, OF

KANSAS CITY, MISSOURI, A CORPORATION OF DELAWARE rrnr: runcrunnPREVENTIVE No Drawing.

This invention relates to improvements in compositions useful forpreventing loss of air in pneumatic tires and for occluding perforationsand for preventing leakage by reason of perforations in elastic tissuesof all types. Preparations of this type have heretofore been made usingel forming organic gums of the nature 0 gum tragacanth and gum acacia,together with fibrous material and water. In such cases, however, theorganic matter present may undergo active fermentation, with resultantformation of gas pressure causing explosions and also resultin wi thwhich the material comes into contact. In the present invention, noorganic matter is used as a gelifying constituent,no acid is present andthere is no excessive causticity. The agent that produces the gel in myinven- 'on is bentonite, either in its 11mm state @treategi to increaseits geh ylng actlon. o t is bentonite is added a sufiicient amount offibrous material, preferably, fine lon fibered asbestos. The bentonlte.used is a m such as is found in South Dakota, Utah, Wyoming, Nevada andCalifornia and is capable of forming a highly viscous mixture or gelwith 200 per cent or more of water. Some bentonite will form a gel orhighly viscous mixture, particularly when specially treated, with asmuch as 3,000 per cent of water. The amount of bentonite used for thepurpose of this invention will var with the quality of the bentonite.

'1 increase the viscosity of the bentonite gel, various substances maybe used, including ma esium oxide, finely ground Portland cement, blastfurnace sla spiigms hcm or calcium slgfige in any form. A typlcal mix-40 ture suf a e or my purpose is a combination Parts Bentonite 100Magnesium oxide 2 Asbestos fiber A mixture of 150 grams of this materialand approximately two quarts of water is sufiicient to thoroughly coatthe inside of an inner tube. Obviously the exact formula 50 will varygreatly according to the particular Application filed July '10,

in decomposition of fabrics or rubber- '0 I 1929. Serial No. 377,327. nY r 3,}

qualit of tlfie bentonite and the asbestos availa 1e. I pure water isnot available it is desirable to put into t e mixture a trace notexceeding 0.1 per cent of a preservative such as salic lic acid orbenzoic acid to prevent the tendency for the decomposition of anyfermentable organic matter.that might be carried by the rubber or be inthe water. The amount of magnesium oxide also varies according to thespecial reactivity of magnesium oxide with'the bentonite used.

In one ordinary method of use a dry composition such as that stated isplaced in the inner tube lining the casin of the automobile tire byremovin the va ve. The valve is thernreplaced an water is put in throughthe valve itself, the inside of the valve having been taken out. Thethreads'of the valve are now thoroughly cleansed and the valve inside isrep aced. Practically any size of puncture, even such as those made bylarge nails will cause a viscous mixture containing the asbestos fiberto flow into the aperture produced, the air pressurebehind it forcingthe material into the hole, thus promptly preventing leakage of any air.The most convenient method of use is to make up the entire mixture inliquid or gel form. This mixture is then forced into the tube.

I claim:

1. Tire puncture preventive containing gebitom'te, magnesium oxide andasbestos 2. A tire puncture preventive comprising asbestos fiber,bentonite and a viscosity promoting agent selected from a groupconsisting of magnesium oxide, Portland cement, blast furnace slag,sodium silicate and calcium silicate.

3. A tire puncture preventive comprising the following in edients inapproximately the proportions y weight of, bentonite 100 parts,magnesium oxide 2 parts, asbestos fiber 50 parts.

In testimony whereof, I have hereunto aflixed my signature.

ROY CROSS.

Examiner

